Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc0ef107333a9822e38758d4b085e9c5e9037213854b27a48e802afb1921f20' 
  AND token = '7AM2+7qBTyGhE+4AqSsZcbayVw27Mwb7RYWJoVCOJGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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