Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b766a095b6816c2fbb41bf6e34e5125da1bcf299e1d5a8e39a83ba1185aeb747' 
  AND token = '16pZWdgdwuyyA4PsyULjH+jRPZwsYmQ7ZJPIHnwP5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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