Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7816040d315cac5e6f80c160fb16927ccbbb458d0399fff372a25a23b68ee50' 
  AND token = 'XO+8NM4yUgSl/bnH0HjHI3FAvwY0tO/UXWGr6KPh608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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