Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e5d0ed4674f0b8b4e287e2b2c27f73bde79ab4ef32677110a9809d0bb38742' 
  AND token = 'tYFhWFlfMO4qua7DaPJkMVPGt8VTpW+bXFmabcH0oaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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