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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ded0dba5b932434c9397a98b5def1a7f3e8b2a397f7d7c5a9cb82be1d632528' 
  AND token = 'nDTw9vDu1MD30HdgzGfwLNzO8bWR9+U5Z5XHn7RLVkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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