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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59dcf109c92891411be2b50f467e8d0b5770caee516e04de027143eba8c2d108' 
  AND token = 'vtkf+3tI2CvY6EQ8mx2wTPx495vzeIAzB28EhJG+U98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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