Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d1c6deeff2eeeee99056b78d31002a1d85be20ee59d77cf7a7fb640c9da658' 
  AND token = 'IwW9Ae86iaHfQaJ5R651Z0Ob4c5qMQAk/aQ6wPq/GOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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