Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7a04b984625032e7ef8e0e8a204ac5d32128e22e37d5edcd52f9d418b69c81' 
  AND token = 'WgsF3yrl5hR/GT3uXxtiysG9P5THxDmRb+n/uf6kNS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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