Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff47f0a29a84822fa5d0f9fa5a75062ffbce7513d382b28cf681d8f92764a9ef' 
  AND token = 'Qepz1DCe0hHKLWSFO/uGxyj8lLhiAxsJo+P8BWGeQfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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