Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831cf154b6a2d63d771cf94d5b98f7cae979aa27183858146c5f2ae854d90ff6' 
  AND token = '2U+b++NykYudcfUrcg6w8MW/GHjY3xNGagdFeo5p37c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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