Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708e60f032ef1b662cc10325a0a088603670e2ed975937c58f23cabba637ccd7' 
  AND token = '7XEzn/hlqjuaRDwr1rg8xjboJUC7XQtg/DmRiTlc5Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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