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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12506ef358acf2ae4b4da386f1cf6325c6261e0fc6617edec2098534aa5c6d3c' 
  AND token = 'NRf7SsftjMrPnPl5V3i0ZLAHcyUoB2RK+aBiU+fX61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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