Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4766d6a8353e216751501c3e1c225e8557743c3b2514ba644a54bb4ac0077acf' 
  AND token = 'vdjkE/ZmkQA+7RSL3u4Vf6RLUx+DW7KMeX2hZTAnI/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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