Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fba2d1cf9c5faa27581dac9d7724b4ee2849a7b556b020c4f3eb20bcea53ae' 
  AND token = 'flCTsPwuD2Z5Jj+Eg4WDy3RjDpxejz05Hr/1wK0Fsjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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