Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621c32d3f71af58c5803b116bb3b0a51959fcbe894205ca6308083334d7fb8db' 
  AND token = 'njQoTzCIr67aHp0Y/lJvCekn+7xl4XGynTidAnEOs7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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