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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20e1603efdbd60f14203608a4613a60da1c1cd283f232d45dd695a89488061de' 
  AND token = 'IH5L8ZD53ZpjwyjqK9w5WtSX2JzyT7HhxR1hDc1yGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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