Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b93b4b376c65d14ca28ed1cf3e0b3e6a03e3c524f7ed58ade20cf18383d154' 
  AND token = 'UifVljrkbdwvANppx677Lu2Vwc6T94Z4TpvZX3QjiLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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