Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c242ed6e2934437bbab766b992b3b81c47c8c5441e10bbbb6876c2354ef04a9' 
  AND token = '+AHU0Er521dNMgOFkz4gHBaaV48CHcz2bWcOP7a/L2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00504

JSON explain

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