Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3eda87e8a7909890b587b1ef3eaaafc6d36969d83cfbbe78174fc396ee3f0f' 
  AND token = 'cHOSuCRkus0dW7Gc3CkE18L5yT+aFKSfpKxdrwiY/EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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