Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5196bb941d8ccb315258a40cc668450736bdb967dacab045663e3bf068c311e8' 
  AND token = 'qpsXRvw2Wu9bJXKeWp0SnpkhKVEnFU9WJRTNxkvCAZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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