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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61a4bf5b56279294d525a3f3bc82b01bc27bc705ece79be7540c8a336a3646bc' 
  AND token = 'hbvgDuDnDp6CSWh3yNgTackNH3WnDqKq7Jek08BTQVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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