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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '276b35072ae51f7b9def6ce368fe6e3b5d7facdebc8ae18e3d4d01bf2c12e192' 
  AND token = 'bnBv2aANx53WtdeiIIXL6HmJFIxciKpcZTbuQYeTy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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