Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5caca975bd8138f5ef193568fe26e8be8fb79320386efa04545759b284bd90' 
  AND token = 'gtQrEpQHkNifQgLUXTMzclPepTCkJhiVpqZRBMx1lmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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