Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5778c615a54486f6a91c316fcdf0523f1ed8de1f0973df748efc67c9582f4ec9' 
  AND token = 'fd2XnsVAWhTZcUQbWeP896GEI0Lg8VJhWxbvM8eWDFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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