Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6998e15d4ff5ff256d5d00f96e76bcbda449751a1b600a39b83aae4d4a5d00b6' 
  AND token = 'ddIcoAn5JIp7QO7IsuG/QHWg8qmpVijYEFFnnBiZFks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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