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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '530db3492bd8f1cb473eb05a3d28552d80b84bf485f359cfd507c63817be3e29' 
  AND token = 'sSDjH3rHdaYjm8IyZopf6BjU4IBsK3hsy2Vd3bebexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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