Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a5f71fe2aa656a52d4169879888c332565690b7f631405c2b9b46009ce7238' 
  AND token = '9IrIgqYp2vMvNTPmIbGAc6Gqc08R1UWyExIweQDe548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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