Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53196e4af50322d6b5b0ff821c2725e9df6435cc9c0fb4df94ba8a66cab5243' 
  AND token = 'tuFPdiDR78NiIVgL4n36mTnNp6sg0YPQUzsXg/w8A+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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