Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68960000539079e0ddfd0e268d94f84ebb49e9014ee4f8af96d8b9eb2a9a7b2c' 
  AND token = 'lvN5yYzHJLuT/wOcsXH16kwriIYOivJjH4C4n41HWCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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