Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e390df3089f453e36a6f2c083bba194fe8fb7d889822ce89ad20ff6eb1a53b57' 
  AND token = '9i2ciPXqKmgLAORlTJlC93Jcxz8j5/xJRY/Dezaj8D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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