Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b3d2fd3dea31185d6d6e2f39ca082da8436b5761f51361447a173fbeaedbc5' 
  AND token = 'oUArOJh/OV6UZ1RB2KWEfdP2v75CEGPmlbFO1CkTP8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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