Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb9f4ccb8fed677a7350bf90d6025e04fed7ec1f0de5c85715afb89ccfc51d8' 
  AND token = 'f4F5BSr6H8c2Zh12nl3xpJ8PTy6agZFvuVLAAZKHXG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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