Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcf8cbfa5d5cfbc2bc29fe3599727b168ab3e8db1a9999ea0c1ed56fe860577' 
  AND token = 'W2aobSRZi3UxpztdaAYygS/X7Z71dMw1LLHPEt7ntHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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