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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22cde46621012b483a2f1608a58cf4aae3b816ed1ddf8f83894d0d6b699f5956' 
  AND token = '+xLzKoFkye7+MmAdzKtxFgvXSiuPfnWUeSXAx051VpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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