Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6571d803efa0a68ab79b0cfa6dd34002570345c7e81f6f7ad0a1b2ec93f62a03' 
  AND token = 'KxI44jESDRG6QLE40ZSVAnQEhsSaFMbbv9gIazxFUa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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