Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b559187dac4d737ef1488e0a7e5cbff21debc89547d45a706b0d598619b84b3' 
  AND token = 'uKcrT+ED4Fj/3UkUwDC6IpdQRuzdU+lV0bnRPqvNvM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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