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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd43190168e5437dc744fd6a746346acabca94d008598aa621e5c08d7aa4c4e68' 
  AND token = 'bG4Rg1pave+cX9+WlNFsrUf2yar1xGPWK7TwWu4Aum0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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