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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13ebb81684b798c9dc168e1c21e2f05cab3d1f98ae84c822ab26055aa1c80cca' 
  AND token = 'r1KgIZgwn4JlwnFcw2E15f72MPhaN1FeZdSWJsTUBTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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