Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62f63cd4e976bb2fc55511b841ec3e7ae92f11bc22c6e35b3078c546d727dc6' 
  AND token = 'kh9lDuMXHzq49OU/RZ8jcrQsnLSFl/TSJW2Lai2NVM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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