Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe941a9a4e8900b93ce0c0bb1e08be8bb3889d4f2da3d252d439ff2e72a94059' 
  AND token = 'G5znyiqPquEfTlMPwoIMbzpWp7ieW803XP1ev+Yyi6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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