Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b79bea2eaf9b4a6e2ff1194aaa2ec4dfcf1d1cf0fc15b581a94db41bd348694' 
  AND token = 'ikGSaJG23vZZ5Ng/d8U5U1eQTVQXHt/X5LCd2deukpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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