Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303feff1273031bfbdfa14630b2c564d35aff5340d99b85a3d72bac783dc2874' 
  AND token = 'ARbhkSDIgVhWpbvfWOqi+QHCJZMh3f0n87w5OxSE6Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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