Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a1770acfd5ce8f2ce770b8a4dd118d224919c678c0588de6e7c374eb21af21' 
  AND token = 'fXUyJXJbwknC+JFI2Dn7Gk/vXGdGfE/8vrFxwWcPphc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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