Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388c118a3f509798b065d008dcad31129866a117d9dde9a04ca60626f625b01c' 
  AND token = 'kyVS39mF/TWSPjHdgMnUj2q0zO+ji0Fp8g+O/Db2zbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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