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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d59bfa8b6288dbb695f9f9adda6617ebfc19b1e4a832f3262f8790e199b6814' 
  AND token = '/6NBU5C5uIbic2MiF8nd6yn6iXjB9+sUe/sdXSeOY1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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