Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a8b89a2b5691cf3212cd34849f0d4be70192e369de5fb22c1cd2f4a4ebcde3' 
  AND token = 'QsxSn/LPtqlanmU42Xez5Rvs8AwfLxbZjWPeImikcTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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