Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835d0efbac64214889a055483a4aebfcef44013b26944acc98d5a98ba35c8dce' 
  AND token = 'fwJp157zSZteogPvXNzmWfIEmoTEuW8/UbjOdcsUHbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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