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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '85f582b62a2ac03dbd81e91e341fffa92f456361c8700b0810d721045eade6b1' 
  AND token = 'SCNHQSlVv1snwgBdRu7ug29aHAekKwnhvrXn22EUiDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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