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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3fbe80016e956f6b1ff18f6d5c7566c05cb767d995a95d0c7fbaf082acf116d5' 
  AND token = 'sjO6tjPchdvKVFGLypFimZb9bIoyoFt6ib2UKXbFid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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