Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87e60fae4532663e8e5412fa9d455e1a668851e5d3127776d0a10da4d97bf78' 
  AND token = 'Z+Ua/hv7VGVLGz39DPHe6tFpxmLPeYERMcN9/w96AEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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