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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '606a3aa71e07136b2d26f210cb8621005570b0b1365f46263b8aa984e4a434d8' 
  AND token = 'vwh19k6wthvqRDcbRl4fo8WTm5sEuVnIalNIpv3i1Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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