Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5d8a5ca92dd0b2830a67d4669b37158108f2efa5dedfab8afdd5ed98c32c09' 
  AND token = 'Zslchp/QGjCWMDXIgnoNGYftduApo9Srk97rvgg+W+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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