Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d8028fcf8831d31ac7f889883e41e813faea6701af2f2a3363c86d07732ad7' 
  AND token = 'vxUQ8NTRkL+o0P5vvLY/oDtiFcmQp9XCWYrFkgMu084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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