Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6809b5b537afc0273207140d8618155487da6904aad867047c6144ba4f82d0ad' 
  AND token = 'uMbEAaQ1K1pHDzBNd/TDUU/O+JbShpkwKHHoByJ5Nko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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