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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40299214cb509d595e934c79eab6b8b2b4c41a4bea710c663ac4968b8e7112c3' 
  AND token = 'EsjELENUp16E8CXh/wMI7vrjRclhBiNHSZgWYTPX2lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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