Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8becc061eb74395b2632a050ea679c7ecc58e64015e2301f8c98097943c7e34f' 
  AND token = 'UfqRs8gX2Y5isIvOS7VXDj3pgMev16PqBY+s40WDAek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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