Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312ada2ccc56bfeed4a039ebcf545330b39844d4291d14187921f753a7ffe94' 
  AND token = 'dz9jh6ZTYrK257ysFzeWk+F+aacRzGfSW7HrwSI5ojo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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