Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe2e37dd5e394955a5033ab92fa26fa0b052a98686d2d1fa93d9e012766fdef' 
  AND token = 'mcgc2ZkVl+k8j7RX7aJqmL0+LnNzNvkRVBLZyCPVOmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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