Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7315c4c458ca5236aa3a56f3453464c28d0bbd80400bae1ac53d28d55b284be9' 
  AND token = 'LvLqIelNawtYn1Dr6+LqTWvbaA/N8t/JaniYdZDcnGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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