Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3747f3963e8f7f69f4aee07806d678138a5f8df01d37d70c15572c8d3978e39' 
  AND token = 'mU8Rz154fA83Ah4AIe9HFP2tiNmBQKaZhbo2BxvUt2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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