SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b467d9e986acc171ef1bbf06b9454b6180ec28d3346aa427de3c26018316dcf' 
  AND token = 'Pu5M/DiBKyBsPUh8MhjYCcpjtgL/sFnAUmsgVAPn/Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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