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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e4f9a6d367da4c93d9fdcad721eb7e73bb8d8ff0f6fa7769e777afe4d30c44f' 
  AND token = 'VdSn5/b0mgI+COoYhv9xp2SVhuZLrb7GZx8SdFkiMbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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