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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '316ec923a15b060e3851a2e99aebc904ac20a9cdeafe0bf5672a3a89fa9aa931' 
  AND token = 'lbtt+7dmENoWHkvEm/9ZsPoOVW92KEQiqUFdRn5WTNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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