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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94eaa7a10ba7dfd3e09c399ed21fb3d4319982c30cb5019618beab20d05d006b' 
  AND token = 'QVm0MFbPrsouZaqcFdF3ljdX1jMuVppjJSjJG8+iGdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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