Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6803f63628daf0f5d315d0c84cdd521af9c2e2b6ebc4c1bbdb2c1771bdc982e5' 
  AND token = 'cOpRm7uU6E73h7cfPsQ2FpmV+FiGG3DqQXK6wXIwoMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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