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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '529cbee83eced9471ff42cf36680daedb4c793e922a2fdb250790fcd8b39d95b' 
  AND token = 'DLLqLjbGDxQUOWn4cNTh4t9/GToALAQo3pM5GZHElaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}