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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8dddb7bb0217a67cc98f2ff513810aa958ad2877a1d0cbff5afb2d8dd0316675' 
  AND token = 'W/aM73eE2kw7WtCINWU6sExAYjjxwT6Wfg2W5RTadRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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