Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86b5b1e99fe88261229a9b88beb5fb59f9249976285d1dde34f7fecf636b9b9' 
  AND token = 'fhoDhbCP8aySbzR34jldCK0xxX2mv4WqNbKRqDPaU6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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