Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7cfc1485d29bc663a4f58591e255e37e04738dd2c4aec93a56d015eeedbf3f' 
  AND token = 'Qhg/bTTNZFh+SppRaOHqA6rG6sAfpAnQTAEce969sDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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