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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90326da4f4516ab6332a0b15e8ad585ad3f5612f7c5dff60cc91e92571c10b47' 
  AND token = 'zGyf3yplMGTKvHHMbTe7oEET7jzIdapKcGGLt9gyCGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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