Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77ecb1ccdac9fd1696dd5f427499146d40168ea725865cc6ae2f1d55ed68b22' 
  AND token = 'tebvKSddWhNjvv7fCd3EoCSM6UhbCCNPd9SdwW1dLjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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