Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eca9e9c8af811d0756bcdc0160a6cb4a3c06c8931499d223cefcd5a5a1991a4' 
  AND token = '4e7UNXulX2DeZIoYDWQxTvKSV4/pga7KeolexjRlA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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