Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ee4aec7819b9ae1aaff3e72fdb37aa4c0b6e6a0a401c787fc5944130dd5a9e3' 
  AND token = 'FMQIAwc9zES+fq3ZTIXIfkhBI3VWgD0cm9colrCrckM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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