Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57403e55535282f4248fe010f11b3120154b3a6e321171868d6947058154b546' 
  AND token = '8A1F08eUfS/xHQ18XpTD5F7HIONkfFwtNT81igrZT0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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