Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9339a9723cf7e859594c0d22d0a658ac05856988729008407fcc3ee6cc7ef2bd' 
  AND token = 'opCA4NYpDyT7xULydkqy4fHDgsygOa901jElZRd/xXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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