Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fa9a31feeeb47f69c0232045bb3c48ddcad161e7fe86c970f9b5c8795e7038' 
  AND token = 'uPlGU9465QfnEMOqRsbxNKQfnVV2sKSaJCBW09pKya4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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