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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8340c16d6d1860fefd4e6c7a5dbd4fa59cdcacdb7a8643695024233345f01c2b' 
  AND token = 'qj4IHs407Pofu2df99vlv/tTz0bNEho2Zo6Z2lHhojw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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