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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05ce7ab3f928c9125ff610ccc2e024f2d63adcb21ed800000eb8a58b0bf36eec' 
  AND token = 'GWWRe9S+FuyFiKPBOiHCuVpjTmkcFgK+HLw9ZJeFdVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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