Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2b8762b827de1ccb1eb639d88d7cdfcf563101487fe160966406c178e0bc1c' 
  AND token = 'GL8sQ8ju19sc7WXeUqfpE7BAvOUza0JdrM1VgEdEsK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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