Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e25747bd0346f656653b3d0536d1b721852dfebc68e715cd61ed6615eea81df' 
  AND token = '3jVKBDTtjn5yJya15PPftTSH9sHepPQAis0+R6PZRk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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