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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae952d13446bbf128600b5b3dc0d90cd0e05c081438a7eee37d9fe929c05e45c' 
  AND token = 'AE8XJyGtccVfi9FQ94sUKgLsMtIL2dWdyuAyoL28KOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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