Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f49569577e8ea3713a0ca01aeab42866f35af6bf07900dec94f3413c3cdf353' 
  AND token = 'azC69aiVuNGVUPVPWdORg2Vllxj9Xd708W/pybmDqWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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