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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f7c857d5fd2d2aeeb6e6b7b8d9c04e2ca0f2361e3e3d77881432552c0803307' 
  AND token = 'KQ1zU9AbeKhmhcA+4XGHMnICIVNifK58cfxIGFJc8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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