Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c15acbdfed35afa0f1f1eaf7220b3d98559fc8ab6a26346376c367f53042fa' 
  AND token = 'OwasRB6eIf+FrW75RPHSfx+7AETUo/gL6mm8VRxVyk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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