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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19cbf8297a80db759f268d80c3c8e12a502bdf063576cbe9bc04f2f88d45a14d' 
  AND token = 'cbJkcx1KpldhxzE9hw9oX1weJDjVkkSxgfKR6dvE2FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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