Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146cb5dde5fa0092bc2f3038db510dfcaa39760d732a52c1c86a0f48d7836c92' 
  AND token = '5Mr88S723mzHieba1r3ls+nHRuS3IzY5odPCunfuQFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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