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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2fcb1fb4d19f2cf495b0c577e049dbdf8a4f6981d60af2052a8bcd37496f6109' 
  AND token = 'IdcC23FEXwdRqXi7CfDGgiv3bBS7JJ2YLWnPF2FUfds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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