Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c90d13c370b3aca82e73cb034ec66ee2cedece3ab2461f6de0516d9fad4211c' 
  AND token = 'hc69zNvegu5orOas1KVZvRrt+HWnvp/d0fTmO8TglJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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