SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd44ef28eeede0a7ab6c2312070e43d91d13ba45c7f970223f98216427d3b1f42' 
  AND token = 'TnNeNLZMYVwWaPZiM64Eo+Ju/F4a+6HBKnLUcTsXGYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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