Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ceb11eae432a2d7506d90d66027b1239c5e5b9874d71a271bd9f803c2b2e4a' 
  AND token = 'Ub7lF0WV7MtoxSMheZS3r7sYAFnTsTTcDjGnrRS2Nw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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