Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3d0a3c392a3a72b19db47911e34445829e082c53d4cfa0d15fff8bc9ae9dea' 
  AND token = 'K7ZK3b6pGl+tDMtj0q45RSqKTWskeyUUWbDjWbnVLvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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