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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93a22ba9b3a859b7a3a77e9045aefce1bdc8381aada257f25be48475771735c3' 
  AND token = 'nr63J2i3L/4q6j8k90EQ17dgSwODuXBAgjY+iCik6OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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