Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55eb198a40c066b16c2b004e8ffc1508e26a7dab955df99bd8912cb28e44cc43' 
  AND token = 'U/DGxo5eSuvb03MwkRoV2pFqJqU5o6VXGY7eR0t+n1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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