Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91a66ea38ba68e617538951cd871eeb312ec1f36a439433274d9f3daa57c6a0' 
  AND token = 'PUoUSFQXKID527IPR810uyQ5c9yHBXWDrhyGNsn2yFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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