Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cbdd2ea6d8ffa785f7e1cee28d8c6e5023c74856948294062abf3e0be456c78e' 
  AND token = 'oLEBjbijpx6IjXQedtG/KHYDtDxdjxYfVtqKELF1RhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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